Re: [PATCH] cpufreq: powernow-k8: Remove bogus smp_processor_id()usage

[Tejun Heo]

Hello, Thomas.

On Sat, Oct 27, 2012 at 07:29:25PM +0200, Thomas Gleixner wrote:
> This is fully preemptible non cpu bound context though the comment in the
> code says:
> 
> 	 * Must run on @pol->cpu.  cpufreq core is responsible for ensuring
> 	 * that we're bound to the current CPU and pol->cpu stays online.
> 
> The core only guarantees that pol->cpu stays online, but it has no way
> to bind the thread and this needs to be fully preemptible context as
> powernowk8_target_fn() calls functions which might sleep.
> 
> So the correct solution is to always go through work_on_cpu().

Yeah, that was stupid.  Rafael already has a patch queued.

  http://git.kernel.org/?p=linux/kernel/git/rafael/linux-pm.git;a=commit;h=e4df1cbcc1f329e53a1fff7450b2229e0addff20

Thanks.

-- 
tejun
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/